I don't know what happened that I got this. When I made it about a year ago I had no errors that I was aware of. I stopped playing for a while and started back around the economy update. Also this was on a new world that I discovered it. All I did was modify the Jump drive file (if you know what I need to change to make it a separate item that just uses the same assets would be great since I am new to making a mod).

Here is the updated definition file for the jumpdrive since the economy update. Maybe you can spot the change and update your file?

Click to expand...

So it looks like the cubeblocks tags is no longer used and a description tag was added. Do I need to change subtype id? I wanted this to be separate from a regular jumpdrive. EDIT: I tried using the default subtype id as well, still the same error.

I dropped your original xml in a mod and tested it and it worked fine. Maybe try verifying your install in steam.

One side note probably not related to the problem.
Change
<BlockPairName>JumpDrive</BlockPairName>
to
<BlockPairName>Creative JumpDrive</BlockPairName>

You want the DisplayName of the block in that spot. It's main purpose is for mirroring, but I noticed changing that was the difference between it trying to overwrite the main jump drive and adding an additional jump drive.

I dropped your original xml in a mod and tested it and it worked fine. Maybe try verifying your install in steam.

One side note probably not related to the problem.
Change
<BlockPairName>JumpDrive</BlockPairName>
to
<BlockPairName>Creative JumpDrive</BlockPairName>

You want the DisplayName of the block in that spot. It's main purpose is for mirroring, but I noticed changing that was the difference between it trying to overwrite the main jump drive and adding an additional jump drive.

Click to expand...

I didn't think of verifying my data. However, I just tried it and still get my same error. Also thank you for the advise on BlockPairName, this will help a lot. I am starting to wonder if it might be a mod compatibility issue now if it worked for you with no errors. I will update this post a little later if I find a conflict.

EDIT: So started an empty world in survival & creative with just my mod and still get the errors. This is driving me crazy.

EDIT2: So I restructured the path to make the mod more clean looking now SE crashes on world load and is not able to upload the error log. So I found the log file and made a gist for it. It feels more detailed in my error then before. Can anyone spot where my issue is from? (Start at line 1268) The Gist: https://gist.github.com/megamanzteam/29aa62c0f2844955c1a1d837de2c9f17

Publish and share the link and I'll take a look at it.
In my experience, situations are like this are usually one tiny little typo somewhere that are very hard to find with just a casual look. Mistakes like that are annoying, but incredibly common.

At first look at your post, it was confusing. Then I saw what was not seen. I went back to CubeBlocks_Utility.sbc and re-did the definitions to match the original file and now no more errors.
The corrected file for reference if others have a similar issue: